After a large investment advisory firm ordered enough food for about a dozen people and didn't tip last week, he tweeted this:

Shout out to the good people of Glass, Lewis & Co. for placing a $170 order and not leaving a tip. @glasslewis

— Brendan O'Connor (@OConnorB_) July 22, 2013

O'Connor said that while tips aren't expected, they're often included on huge orders like that.

Two days after his tweet, his boss confronted him, O'Connor wrote. Glass, Lewis & Co. had apparently called to complain.

"It was unfortunate but he was going to have to let me go," O'Connor wrote. "The company has a way of doing things and he thought I'd understood that. I had embarrassed him and the company and that was that."